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Effect of thickness on characteristics of ZnSe thin film synthesized by vacuum thermal evaporation

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Journal of Theoretical and Applied Physics

Abstract

Zinc selenide (ZnSe) thin films with various thicknesses were grown on ultrasonically clean glass substrates using vacuum evaporation of 99.99% pure ZnSe powder. Thickness dependence of the structural, optical and electrical properties was thoroughly investigated. X-ray diffraction (XRD) analyses revealed that (110) ZnSe plane is the dominant crystal plane for all the fabricated films. Both dislocation density and micro-strain go down with the increase in film thickness, indicating lower lattice defects and improvement in crystallinity at higher film thickness. Transmittance spectra show that all the films have almost linear upward tendency of transmittance in near-infrared region and small fluctuations in visible region for higher-thickness films. With the increase in film thickness, the optical bandgap increases and also an increasing tendency of dielectric constant was observed. Studies of electrical properties showed a sharp increase in carrier mobility and concentration with film thickness. As the film thickness increases from 30 to 90 nm, the carrier mobility goes up from 255 to 1250 cm2/VS and the carrier concentration increases from 2.14 × 1018 to 9.37 × 1018 cm−3. The electrical transport properties of the deposited thin films were explained in terms of scattering of the charge carrier.

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Authors and Affiliations

  1. Department of Electrical and Electronic Engineering, University of Chittagong, Chittagong, 4331, Bangladesh

    Md. Abu Sayeed & Hasan Khaled Rouf

  2. Experimental Physics Division, Atomic Energy Center, Dhaka, 1000, Bangladesh

    Kazi Md. Amjad Hussain

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  1. Md. Abu Sayeed
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  2. Hasan Khaled Rouf
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  3. Kazi Md. Amjad Hussain
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Correspondence to Hasan Khaled Rouf.

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Sayeed, M.A., Rouf, H.K. & Hussain, K.M.A. Effect of thickness on characteristics of ZnSe thin film synthesized by vacuum thermal evaporation. J Theor Appl Phys 14, 251–259 (2020). https://doi.org/10.1007/s40094-020-00378-1

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